I am trying to configure Notepage to utilise a Zoom 4595 GSM USB dongle, but am having issues:

1. Notepage can see it and communicate with the modem, but errors when sending the SMS
2. The following is the activity from a Terminal session within Putty to the 4595 device (< indicates a command passed and > indicates the return value):
< AT <ENTER>
>OK
<AT+CMGF=1 <ENTER>
>OK
AT+CMGS="0712312312" <ENTER>
>ERROR
3. I have been informed by Zoom support I need to add the following AT commands before the SMS AT command:
AT+CFUN=1 (power on)
AT+CNMI=2,1,0,1,0 (New Messages Indication to TE)

the "AT+CFUN=1" command is a reset command. You should verify that that modem REQUIRES it before every message. Many cellular networks will see multiple reset commands as an indication of a problem device and deactivate access until the issue is resolved

Still not working. I have gone back to Zoom support to determine if any additional AT commands are required, but if anyone is aware I would appreciate assistance as this is preventing us sending SMS alerts from SolarWinds currently.

Hm... well, the modem is erroring out when the message submission command is issued. That generally indicates that the cellular modem either isn't registered on the carrier network, the cell signal is weak or some other technical issue with the device. I'm definitely interested in what Zoom support tells you.

4) After opening the connection, type the following and hit enter after each command:
AT
AT+CFUN=1 (Note: Wait 10 seconds after issuing this command before proceeding)
AT+CNMI=2,1,0,1,0
AT+CSQ
AT+CMGF=1
AT+CMGS="PhoneNumber"
Enter the text of a message to be delivered, then press enter.
Ctrl+Z

Please let me know what the response was to each of the commands in the sequence.

I'm a little baffled, to tell you the truth. We passed each of the commands Zoom support said that the modem required and the modem seems to respond just fine until you pass the AT+CMGS command to identify what phone number the SMS should be delivered to and I can't explain that. I'm definitely interested in what Zoom support has to offer on this.